Holographic TV may remain a distant prospect, but the Media Lab's Camera Culture group is developing the next best thing: screens capable of producing glasses-free 3D images that can be seen from various angles. "We want something that's commercially viable in the near-term," says Douglas Lanman, one of the team behind two prototypes. "So we're using something that's commonly available: multi-layered LCD panels."
To expand the viewing angle, the group combined three layers of LCD panels, each one capable of creating pixel-by-pixel light-filtering patterns. These can refresh 120 times per second, thanks to a specially tailored algorithm, allowing for sophisticated manipulation of the backlight to display a series of different images. Since the human eye cannot perceive flickering at such a high rate, the viewer sees a coherent, high-resolution 3D image. And because the system is programmed to project pairs of offset images in various directions, the viewer sees 3D images from multiple perspectives within a 20-degree viewing angle. A second prototype uses two LCD panels with a sheet of lenses between them to refract light left
and right. With this version, the viewing angle is expanded to 50-degree, with little resolution loss.
By: Daniel Cossins, Edited by: David Cornish
Continue reading...Source: http://www.wired.co.uk/magazine/archive/2012/11/start/this-revolution-will-be-televised
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